David B. Rudders Sally Roman Hunter Tipton Virginia...

David B. Rudders

Sally Roman

Hunter Tipton

Virginia Institute of Marine Science

Sea Scallop Plan Development Team

Falmouth, MA

August 30-31, 2016

Preliminary PDT use only.

2016 VIMS-Industry Cooperative SurveysMid-Atlantic Bight

720'0"W

720'0"W

750'0"W

750'0"W

7330'0"W

7330'0"W

403

0'0

"N

403

0'0

"N

390

'0"N

390

'0"N

373

0'0

"N

373

0'0

"N

360

'0"N

360

'0"N

0 10 20 30 405

Nautical Miles

Legend

Station Locations

Leg 1

Leg 2

Rotational Closed Areas

VIMS Survey Domain

NMFS Strata

2016 VIMS-Industry Cooperative SurveysNLCA and CA II

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690'0"W

690'0"W

6930'0"W

6930'0"W

700'0"W

700'0"W

41

30

'0"N

41

30

'0"N

41

0'0

"N

41

0'0

"N

40

30

'0"N

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'0"N

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"N

40

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39

30

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39

30

'0"N

Legend

! Station Locations

NL Groundfish Closed Area

Essential Fish Habitat Closure Areas

VIMS Survey Extent

NMFS Strata

0 6 12 18 243

Nautical Miles

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660'0"W

660'0"W

6630'0"W

6630'0"W

670'0"W

670'0"W

41

30

'0"N

41

30

'0"N

41

0'0

"N

41

0'0

"N

40

30

'0"N

40

30

'0"N

40

0'0

"N

40

0'0

"N

0 6 12 18 243Nautical Miles

Legend

! Station Locations

Rotational Closed Area

VIMS CAII Domain

NMFS Strata

2016 VIMS-Industry Cooperative SurveysPrimary Project Objectives

Assess the abundance and

distribution of scallops in the Mid-

Atlantic Bight, NLCA and CAII. Mid-Atlantic Bight (Block Island to

VA/NC)

2015 SAMS Area

2015 SAMS Extended Area

NLCA and surrounds

2015 SAMS Area


CA II and surrounds

2015 SAMS Area


Estimate exploitable biomass.

Biomass of scallops available for

capture with 4 inch ring commercial

dredge.

2016 VIMS-Industry Cooperative SurveysSecondary Project Objectives

Gear performance

Estimate size selectivity and relative performance of 4.0 ring dredge

(NBD & CFTDD).

Scallop Biology & Product Quality

Spatially and temporally explicit shell height:meat weight relationships.

Assess metrics associated with product quality.

Examine the incidence and pathology of the shell disease observed in

survey areas.

Investigate the spatial distribution including incidence and intensity of

the parasitic nematode observed in scallop meats.

Finfish Bycatch

Obtain a snapshot of finfish bycatch rates and species assemblages in

the surveyed areas from the commercial dredge.

Scallop Predators

Quantify the species composition, spatial extent and abundance of

scallop predators (crabs and starfish).

Additional Sample Requests

Jonah crabs, scallops for gray meat analysis, hake sp., and Astarte

2016 VIMS-Industry Cooperative Surveys

Sampling design Stratified random design

NMFS shellfish strata plus

Allocation

Area, prior year catch data

(biomass, number) or modified

proportional allocation (CA II and

NLCA)

Vessels MAB Survey: 2 vessels with 1 new to the

survey

Carolina Capes II (veteran), Sea Hawk

(new)

NLCA Survey: Celtic (veteran)

NLCA Survey: K.A.T.E. (veteran)

Data acquisition system Electronic boards (1mm res.)

Custom front end to Access DB

Integrated with Marel scale

Automated recording of wheel house data

All other protocols remained the

same (see scallop survey peer review

materials for details)

6730'0"W

6730'0"W

690'0"W

690'0"W

7030'0"W

7030'0"W

720'0"W

720'0"W

7330'0"W

7330'0"W

750'0"W

750'0"W

450

'0"N

450

'0"N

433

0'0

"N

433

0'0

"N

420

'0"N

420

'0"N

403

0'0

"N

403

0'0

"N

390

'0"N

390

'0"N

373

0'0

"N

373

0'0

"N

360

'0"N

360

'0"N

343

0'0

"N

343

0'0

"N

0 30 60 90 12015 Nautical Miles

Legend

Survey

MAB Survey

NLCA Survey

CA II Survey

EFH

Rotational Closed Areas

VIMS Survey Extents

NMFS Strata

2016 VIMS-Industry Cooperative SurveysAnalytical Framework

j

j

j

SubAreaEfficiency

erTowAreaSweptp

eaTowinSubarCatchWtper

ssTotalBioma

Area swept per tow Navigational info

Tilt sensor

Catch weight per tow (stratified means and

variances) Length frequencies

Length-weight relationship (for this analysis regional SARC 59).

Selectivity (Yochum and DuPaul, 2008)

Efficiency (constant) Values from SARC 2014

65%Commercial Dredge

40% NMFS Survey Dredge

Exploitable Biomass Selectivity curve applied to catch for both the survey and

commercial dredges (Yochum and DuPaul, 2008)

Sub-Area (constant) Dependent upon the spatial extent of the survey domain

2015 NMFS SAMS regions and zones

2016 SAMS VIMS extended

DMVDMV

DMVVIR

HCNYB

ETET_open

HCHCS

ETET_close

ETNYB_inshore

HCNYB_Inshore

HCsrNYB

LI BI

LI LI

720'0"W

720'0"W

7330'0"W

7330'0"W

750'0"W

750'0"W

420

'0"N

420

'0"N

403

0'0

"N

403

0'0

"N

390

'0"N

390

'0"N

373

0'0

"N

373

0'0

"N

0 25 5012.5 Nautical Miles

2016 VIMS Mid Atlantic SAMS Region/Zone Designations

NMFS Extent Region and Zones

VIMS Extent

GSC_SNLS_NA

GSC_WNLS_AC_N

GSC_SNLS_AC_S

GSC_SNLS_Ext

690'0"W

690'0"W

6930'0"W

6930'0"W

700'0"W

700'0"W

41

0'0

"N

41

0'0

"N

40

30

'0"N

40

30

'0"N

40

0'0

"N

40

0'0

"N

39

30

'0"N

39

30

'0"N

0 10 205 Nautical Miles

2016 VIMS NLCA SAMS Region/Zone Designations

NMFS Extent Regions and Zones

VIMS Extent

EFH

2016 VIMS-Industry Cooperative SurveysSAMS Regions/Zones

The projection model

(SAMS) examines the

resource on a variety of

spatial scales. region, zone

The VIMS surveys

included some areas

outside of the NMFS area

specification.

Biomass estimates will

be presented in the

context of the VIMS

expanded areas.

CAII_SCAII_S_AC

CAII_SCAII_S_Ext

660'0"W

660'0"W

6630'0"W

6630'0"W

670'0"W

670'0"W

6730'0"W

6730'0"W

420

'0"N

420

'0"N

413

0'0

"N

413

0'0

"N

410

'0"N

410

'0"N

403

0'0

"N

403

0'0

"N

400

'0"N

400

'0"N

0 10 205 Nautical Miles

2016 VIMS CA II SAMS Region/Zone Designations

CAII_S

VIMS Extent

2016 VIMS-Industry Cooperative SurveysSH:MW Relationship

SH:MW samples were taken from all stations that had scallops (15/station): MAB Survey: ~5000 NLCA and CA II Surveys: ~ 1,000/survey

The objective is to construct a model to predict meat weight based on a suite of potential covariates (i.e. shell height, depth, SAMS area, sex, disease).

Average depth was calculated for each tow from tilt sensor

A GLMM was used to fit model (Gamma distribution, log link, random effect at the station level) with R v 3.3.1 Package lme4.

2016 VIMS-Industry Cooperative MAB SurveySH:MW Results

MAB SAMS Areas

Significantly different relationships between SAMS Regions and Zone.

Likely a function of average depths for each of subarea, as well as the temporal spread of the

sampling

Meat Weight by SAMS Region

Shell Height (mm)

Meat

Weig

ht

(g)

20

40

60

80

0 50 100 150

DMVETHC

HCsrLI

Meat Weight by SAMS Zone

Shell Height (mm)

Meat

Weig

ht

(g)

20

40

60

80

0 50 100 150

DMV DMV ET ET_open HC NYB HC HCS

HCsr NYB ET ET_close ET NYB_inshore HC NYB_inshore

LI LI LI BI

2016 VIMS-Industry Cooperative NLCA SurveySH:MW Results

NLCA SAMS Areas

Significantly different relationships between SAMS Regions and Zones.

Likely a function of average depths for each of subarea, as well as the density of scallops and

temporal spread of the sampling


Shell Height (mm)

Meat

Weig

ht

(g)

20

40

60

80

100

0 50 100 150

NLS_NA

NLS_AC_N

NLS_AC_S

NLS_EXT

Meat Weight by SAMS Region

Shell Height (mm)

Meat

Weig

ht

(g)

20

40

60

80

100

0 50 100 150

GSC_S GSC_W

2016 VIMS-Industry Cooperative CA II SurveySH:MW Results

CA II SAMS Areas

Significantly different relationships between SAMS Zones.

Likely a function of average depths for each of subarea, as well as the temporal spread of the

sampling


Shell Height (mm)

Meat

Weig

ht

(g)

20

40

60

80

0 50 100 150

CAII_S_AC CAII_S_ext

2015 VIMS-Industry Cooperative SurveysSH:MW Results NLCA Survey

Contour plot of meat weights

predicted from a GAMM for a 100 mm

scallop in the NLCA survey area.

Gradient of meat weights was

observed in the survey area.

Small meats observed in the south in

deeper water with high densities of

scallops .

Biomass of an area is a dynamic

process that has significant spatial

and temporal components that

warrant consideration in the

specification process.

SARC 59 estimates one subarea

coefficient for the NLCA. -70.0 -69.8 -69.6 -69.4 -69.2 -69.0 -68.8

40.0

40.2

40.4

40.6

40.8

41.0

41.2

Predicted Meat Weights (g) for a 100 mm Scallop in the VIMS Natucket Lightship Survey Domain

Longitude

Latitu

de

10

15

20

25

10

12

14

14 16

18 20 20

22 24

26

28

2015 VIMS-Industry Cooperative SurveysNLCA Survey

-70.0 -69.8 -69.6 -69.4 -69.2 -69.0 -68.8

40.0

40.2

40.4

40.6

40.8

41.0

41.2

Interpolated Map of Scallop Meat Counts Per Poundin the VIMS Natucket Lightship Survey Domain

Longitude

Latitu

de

20

40

60

80

100

120

140

10

10

20 20

20

20

30

30

30

40

40 40

50 50

80

90

Interpolated Map of Scallop Meat Counts Per Pound in the

VIMS Nantucket Lightship Survey Domain

2016 VIMS-Industry Cooperative MAB SurveyLength Frequency- SAMS Region

Length Interval (mm)

Fra

ction o

f T

ota

l

0.00

0.05

0.10

0.15

0.20

0.25

Commercial Dredge n= 5,587Mean Length = 118.17 mm

Survey Dredge n= 7,043Mean Length = 75.71 mm



DMV





ET





HC

0.00

0.05

0.10

0.15

0.20

0.25

0 50 100 150

Commercial Dredge n= 6,130

Mean Length = 93.52 mm

Survey Dredge n= 10,277






HCsr

0 50 100 150









LI

Commercial DredgeSurvey Dredge

2016 VIMS-Industry Cooperative MAB SurveyLength Frequency- SAMS Zone


Fra

ction o

f T

ota

l

0.0

0.1

0.2

0.3


Survey Dredge n= 6,858Mean Length n= 76.59 mm



DMV DMV





ET ET_close





ET ET_open

Commercial Dredge n= 16Mean Length = 95.62 mm

Survey Dredge n= 67Mean Length n= 51 mm

Commercial Dredge n= 16Mean Length = 95.62 mm

Survey Dredge n= 67Mean Length n= 51 mm

ET NYB_inshore





HC HCS

0.0

0.1

0.2

0.3

0 50 100 150




Mean Length n= 85.21 mm





HC NYB

0 50 100 150

Commercial Dredge n= 581


Survey Dredge n= 517




Survey Dredge n= 517


HC NYB_inshore

0 50 100 150









HCsr NYB

0 50 100 150









LI BI

0 50 100 150









LI LI


2016 VIMS-Industry Cooperative NLCA SurveyLength Frequency- SAMS Region


Fra

ction o

f T

ota

l

0.00

0.05

0.10

0.15

0.20

0 50 100 150









GSC_S

0 50 100 150









GSC_W


2016 VIMS-Industry Cooperative NLCA SurveyLength Frequency- SAMS Zone


Fra

ction o

f T

ota

l

0.00

0.05

0.10

0.15

0.20

0.25Commercial Dredge n= 142,144





GSC_S NLS_AC_S





GSC_S NLS_EXT

0.00

0.05

0.10

0.15

0.20

0.25

0 50 100 150









GSC_S NLS_NA

0 50 100 150









GSC_W NLS_AC_N


2016 VIMS-Industry Cooperative CA II SurveyLength Frequency- SAMS Region


Fra

ction o

f T

ota

l

0.00

0.05

0.10

0.15

0 50 100 150









CAII_S


2016 VIMS-Industry Cooperative CA II SurveyLength Frequency- SAMS Zone


Fra

ction o

f T

ota

l

0.00

0.05

0.10

0.15

0.20

0 50 100 150


Mean Length = 113.65


Mean Length = 98.31




Mean Length = 98.31

CAII_S CAII_S_AC

0 50 100 150




Mean Length = 76.32




Mean Length = 76.32

CAII_S CAII_S_ext


2016 VIMS-Industry Cooperative MAB SurveyScallop Distribution

D

D

D DD

D

D

D

D

D

D

D

DD

D

D

D

D

D

DD

D

DDD

DDDD

D

DD

D

DDD

720'0"W

720'0"W

7330'0"W

7330'0"W

750'0"W

750'0"W

403

0'0

"N

403

0'0

"N

390

'0"N

390

'0"N

373

0'0

"N

373

0'0

"N


Biomass Per Tow

NMFS Survey Dredge (grams)

D 0

0.01 - 6,731.91

6,731.92 - 18,516.80

18,516.81 - 64,042.48

64,042.49 - 174,551.65

VIMS Survey Domain

2016 VIMS MAB Survey Scallop Catch

D

D

D D

D

D

D

D D

D

DD

D D

DD

D

D

D

DD

D

D

D

D

D

DD D D

DD

D

DD

DDD

DDDDD

DD

D

DD

D

DD

D

D D

D

D

DDD

DD

D

DD

DDDD D D D DD

D

D

DD D

D

D

D D

D

D

D

D D

D

DD

D D

DD

D

D

D

D

D

DD D D

DD

D

DD

DDD

DDDDD

DD

D

DD

D

DD

D

D D

D

D

DD

DD

D

DD

DDDD D D D DD

D

D

DD D

720'0"W

720'0"W

7330'0"W

7330'0"W

750'0"W

750'0"W

403

0'0

"N

403

0'0

"N

390

'0"N

390

'0"N

373

0'0

"N

373

0'0

"N


Number Per Tow NMFS Survey Dredge (number)

D 0

1 - 200

201 - 500

501 - 4,000

4,001 - 9,030

VIMS Domain

2016 VIMS MAB Survey Scallop Catch

Pre-Recruit Scallops (

2016 VIMS-Industry Cooperative NLCA & CA II

SurveysScallop Distribution

2016 VIMS-Industry Cooperative SurveysTotal Biomass - Region

Survey SAMS RegionTotal Biomass

(mt)

SE Biomass

(mt)

Density

(scal/m^2)Avg MW (g) Total #

MAB

DMV 4,125.96 434.32 0.07 11.24 394,116,594.99

ET 22,485.56 1,023.28 0.70 10.47 2,035,382,047.86

HC 17,115.44 722.81 0.33 12.07 1,395,865,849.41

HCsr 4,937.67 917.70 0.17 10.42 492,190,000.77

LI 16,202.76 742.02 0.07 17.41 922,179,496.32

NLCA

GSC_S 58,706.81 5,353.98 2.56 8.62 6,723,574,032.92

GSC_W 3,571.57 298.14 0.12 30.06 118,974,287.52

VIMS_45 5.41 2.00 0.00 30.20 179,063.89

CA II CAII_S 18,229.87 994.76 0.26 15.83 1,160,535,650.77

2016 VIMS-Industry Cooperative SurveysTotal Biomass Region/Zone

Survey SAMS Region ZoneTotal Biomass

(mt)

SE Biomass

(mt)

Density


MAB

DMV DMV 4,031.45 397.25 0.09 11.49 375,179,508.77

DMV VIR 16.77 1.79 0.01 2.24 7,471,138.85

ET ET_close 10,975.09 855.54 1.06 9.83 1,015,942,940.96

ET ET_open 11,324.17 450.02 0.48 11.37 989,468,483.68

ET NYB_inshore 61.55 0.41 0.01 3.39 19,618,868.30

HC HCS 13,812.14 633.46 0.44 11.78 1,170,351,530.61

HC NYB 2,603.36 339.48 0.18 14.46 180,727,689.59

HC NYB_inshore 665.22 73.62 0.01 16.58 40,129,837.46

HCsr NYB 4,937.66 917.75 0.17 10.42 492,176,971.18

LI BI 1,508.47 83.34 0.10 20.41 73,974,647.90

LI LI 14,713.37 736.31 0.07 17.16 848,918,181.20

NLCA

GSC_S NLS_AC_S 22,657.69 2,344.53 7.48 7.04 3,217,822,591.33

GSC_S NLS_EXT 1,696.60 509.55 0.31 17.49 100,240,930.77

GSC_S NLS_NA 25,801.89 3,970.65 1.38 11.58 2,230,524,250.16

GSC_W NLS_AC_N 3,571.57 298.14 0.12 30.06 118,974,287.52

VIMS_45 5.41 2.00 0.00 30.20 179,063.89

CA IICAII_S CAII_S_AC 13,875.77 866.06 0.26 20.23 477,721,662.76

CAII_S CAII_S_ext 4,963.42 427.42 0.25 10.34 688,469,033.23

2016 VIMS-Industry Cooperative SurveysExploitable Biomass Survey - Region


(mt)

SE Biomass

(mt)

Density


MAB

DMV 1,469.98 157.07 0.07 21.79 70,117,637.93

ET 6,587.21 241.11 0.70 15.95 390,650,676.93

HC 5,785.78 253.78 0.07 18.60 300,577,220.62

HCsr 1,363.84 144.69 0.03 15.98 74,358,084.86

LI 7,301.62 312.27 0.07 22.34 321,313,419.67

NLCA

GSC_S 9,721.64 1,004.46 2.56 16.16 595,200,859.59

GSC_W 2,782.11 212.06 0.09 33.72 81,548,737.32

VIMS_45 3.62 1.34 0.001 32.55 111,077.97

CAII CAII_S 10,186.87 592.36 0.26 23.80 420,696,521.70

2016 VIMS-Industry Cooperative SurveysExploitable Biomass Survey Region/Zone

Survey SAMS Region Zone

Total

Biomass

(mt)

SE Biomass

(mt)

Density


MAB

DMV DMV 1,440.98 145.99 0.09 21.81 68,868,929.86

DMV VIR 0.18 0.03 0.00 3.71 47,855.93

ET ET_close 3,159.04 197.06 1.06 15.59 183,249,825.64

ET ET_open 3,415.01 131.55 0.10 16.32 203,522,665.83

ET NYB_inshore 3.45 0.05 0.00 9.23 383,992.95

HC HCS 4,422.69 229.24 0.09 18.28 239,014,768.09

HC NYB 959.68 98.96 0.05 19.90 48,270,214.98

HC NYB_inshore 405.64 39.40 0.00 30.80 13,169,425.83

HCsr NYB 1,363.19 144.63 0.03 15.98 74,324,998.92

LI BI 799.24 39.25 0.04 25.04 31,933,585.39

LI LI 6,515.49 309.41 0.07 22.05 289,852,478.73

NLCA

GSC_S NLS_AC_S 1,741.46 185.82 7.48 11.03 157,851,406.44

GSC_S NLS_EXT 681.89 180.23 0.11 20.79 32,824,672.28

GSC_S NLS_NA 6,509.38 929.39 0.21 19.13 340,146,590.83

GSC_W NLS_AC_N 2,782.11 212.06 0.09 33.72 81,548,737.32

VIMS_45 VIMS_45 3.62 1.34 0.00 32.55 111,077.97

CA IICAII_S CAII_S_AC 8,997.18 520.28 0.13 25.51 347,640,879.00

CAII_S CAII_S_ext 1,720.24 152.22 0.25 18.13 92,805,506.65

2016 VIMS-Industry Cooperative SurveysExploitable Biomass - Commercial by Region


(mt)

SE Biomass

(mt)

Density


MAB

DMV 2,520.01 500.68 0.02 32.78 78,783,082.93

ET 12,431.27 927.26 0.55 23.75 502,606,892.42

HC 10,885.20 1,868.13 0.06 26.82 403,258,055.37

HCsr 1,219.18 149.83 0.01 26.16 40,744,069.92

LI 7,183.71 531.89 0.03 31.31 224,762,172.76

NLCA

GSC_S 8,756.97 1,910.63 0.80 21.38 407,904,423.34

GSC_W 3,463.90 323.75 0.13 36.61 93,837,894.39

VIMS_45 1.36 0.82 0.00 46.91 29,038.49

CAII CAII_S 6,574.37 668.20 0.07 28.92 221,450,176.26

2016 VIMS-Industry Cooperative SurveysExploitable Biomass - Commercial by Region/Zone

Survey SAMS Region_ZoneTotal Biomass

(mt)

SE Biomass

(mt)

Density


MAB

DMV DMV 2,488.60 490.24 0.02 32.78 77,805,762.73

DMV VIR 0.00 0.00 0.00 0.00 0.00

ET ET_close 6,740.28 929.89 1.04 22.67 283,002,777.88

ET ET_open 6,119.70 478.98 0.24 25.27 234,758,902.35

ET NYB_inshore 3.11 1.09 0.00 26.20 118,684.81

HC HCS 6,645.94 1,143.73 0.15 26.48 255,826,265.84

HC NYB 3,700.39 1,433.83 0.09 27.47 134,610,305.82

HC NYB_inshore 526.10 73.59 0.01 41.32 12,731,296.67

HCsr NYB 1,219.10 149.82 0.04 26.16 40,742,725.13

LI BI 522.31 31.63 0.03 32.86 15,906,955.82

LI LI 6,665.26 530.08 0.03 31.20 208,962,219.62

NLCA

GSC_S NLS_AC_S 960.14 289.76 1.62 15.15 63,359,444.84

GSC_S NLS_EXT 516.61 216.69 0.06 25.78 20,020,927.73

GSC_S NLS_NA 6,774.37 1,819.28 0.18 22.94 295,157,372.01

GSC_W NLS_AC_N 3,463.90 323.75 0.10 36.61 93,837,894.39

VIMS_45 VIMS_45 1.36 0.82 0.00 46.91 29,038.49

CAIICAII_S CAII_S_AC 6,149.25 609.17 0.10 29.29 138,811,858.69

CAII_S CAII_S_ext 775.98 113.03 0.02 26.52 9,745,384.04

2016 VIMS-Industry Cooperative SurveysSummary

The good

Biomass in the MAB closed area, as well as the NLCA and

CA II access areas and surrounds appear to be strong.

Causes of concern

General lack of strong recruiting year class across all

surveyed areas.

How to handle the age 4 scallops in the NLS if expected

growth is not realized. This may result in a reduced

contribution in terms of yield to the fishery relative to

projections.

Continued and expanded presence of a nematode parasite

observed in the scallop meats which may limit effort in

south portions of the resource (DMV and parts of ET).

Acknowledgements

The owners, captains and crews;

F/V Carolina Capes II

F/V Sea Hawk

F/V K.A.T.E

F/V Celtic

Daniel Smith, Lee Rollins, Chase

Long and Nick Cardoso

Support from NMFS NEFSC: Dvora

Hart, Vic Nordahl.

Funding through Sea Scallop RSA

program.

Date post:	27-May-2018
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David B. Rudders Sally Roman Hunter Tipton Virginia...

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